package metrics import ( "fmt" "sync" "time" "github.com/prometheus/client_golang/prometheus" ) const ( wcSubsystem = "writecache" wcShardID = "shard_id" wcSuccess = "success" wcStorage = "storage" wcMode = "mode" ) type shardIDMode struct { shardID, mode string } type WriteCacheMetrics interface { AddGetDuration(shardID string, success bool, d time.Duration, storageType string) AddDeleteDuration(shardID string, success bool, d time.Duration, storageType string) AddPutDuration(shardID string, success bool, d time.Duration, storageType string) IncActualCount(shardID string, storageType string) DecActualCount(shardID string, storageType string) SetActualCount(shardID string, count uint64, storageType string) SetEstimateSize(shardID string, size uint64, storageType string) SetMode(shardID string, mode string) IncFlushCounter(shardID string, success bool, storageType string) IncEvictCounter(shardID string, storageType string) } type writeCacheMetrics struct { getDuration metric[*prometheus.HistogramVec] putDuration metric[*prometheus.HistogramVec] deleteDuration metric[*prometheus.HistogramVec] flushCounter metric[*prometheus.CounterVec] evictCounter metric[*prometheus.CounterVec] actualCount metric[*prometheus.GaugeVec] estimatedSize metric[*prometheus.GaugeVec] modeMetrics map[shardIDMode]metric[prometheus.GaugeFunc] modeValues map[string]string modeMtx sync.RWMutex } func newWriteCacheMetrics() *writeCacheMetrics { return &writeCacheMetrics{ getDuration: newWCMethodDurationCounter("get"), putDuration: newWCMethodDurationCounter("put"), deleteDuration: newWCMethodDurationCounter("delete"), flushCounter: newWCOperationCounterVec("flush", []string{wcShardID, wcStorage, wcSuccess}), evictCounter: newWCOperationCounterVec("evict", []string{wcShardID, wcStorage}), actualCount: newWCGaugeVec("actual_objects_count", "Actual objects count in writecache", []string{wcShardID, wcStorage}), estimatedSize: newWCGaugeVec("estimated_size_bytes", "Estimated writecache size", []string{wcShardID, wcStorage}), modeMtx: sync.RWMutex{}, modeMetrics: make(map[shardIDMode]metric[prometheus.GaugeFunc]), modeValues: make(map[string]string), } } func (m *writeCacheMetrics) AddGetDuration(shardID string, success bool, d time.Duration, storageType string) { setWriteCacheDuration(m.getDuration.value, shardID, success, d, storageType) } func (m *writeCacheMetrics) AddDeleteDuration(shardID string, success bool, d time.Duration, storageType string) { setWriteCacheDuration(m.deleteDuration.value, shardID, success, d, storageType) } func (m *writeCacheMetrics) AddPutDuration(shardID string, success bool, d time.Duration, storageType string) { setWriteCacheDuration(m.putDuration.value, shardID, success, d, storageType) } func (m *writeCacheMetrics) IncActualCount(shardID string, storageType string) { m.actualCount.value.With(prometheus.Labels{ wcShardID: shardID, wcStorage: storageType, }).Inc() } func (m *writeCacheMetrics) DecActualCount(shardID string, storageType string) { m.actualCount.value.With(prometheus.Labels{ wcShardID: shardID, wcStorage: storageType, }).Dec() } func (m *writeCacheMetrics) SetActualCount(shardID string, count uint64, storageType string) { m.actualCount.value.With(prometheus.Labels{ wcShardID: shardID, wcStorage: storageType, }).Set(float64(count)) } func (m *writeCacheMetrics) SetEstimateSize(shardID string, size uint64, storageType string) { m.estimatedSize.value.With(prometheus.Labels{ wcShardID: shardID, wcStorage: storageType, }).Set(float64(size)) } func (m *writeCacheMetrics) SetMode(shardID string, mode string) { m.modeMtx.Lock() defer m.modeMtx.Unlock() m.modeValues[shardID] = mode key := shardIDMode{ shardID: shardID, mode: mode, } if _, found := m.modeMetrics[key]; found { return } metric := newGaugeFunc( prometheus.GaugeOpts{ Namespace: namespace, Subsystem: wcSubsystem, Name: "writecache_mode", Help: "Writecache mode value", ConstLabels: prometheus.Labels{ wcShardID: shardID, wcMode: mode, }, }, func() float64 { m.modeMtx.RLock() defer m.modeMtx.RUnlock() value := m.modeValues[shardID] if value == mode { return 1 } return 0 }) mustRegister(metric) m.modeMetrics[key] = metric } func (m *writeCacheMetrics) IncFlushCounter(shardID string, success bool, storageType string) { m.flushCounter.value.With(prometheus.Labels{ wcShardID: shardID, wcSuccess: fmt.Sprintf("%v", success), wcStorage: storageType, }).Inc() } func (m *writeCacheMetrics) IncEvictCounter(shardID string, storageType string) { m.evictCounter.value.With(prometheus.Labels{ wcShardID: shardID, wcStorage: storageType, }).Inc() } func (m *writeCacheMetrics) register() { mustRegister(m.getDuration) mustRegister(m.putDuration) mustRegister(m.deleteDuration) mustRegister(m.actualCount) mustRegister(m.estimatedSize) mustRegister(m.flushCounter) mustRegister(m.evictCounter) } func setWriteCacheDuration(m *prometheus.HistogramVec, shardID string, success bool, d time.Duration, storageType string) { m.With( prometheus.Labels{ wcShardID: shardID, wcSuccess: fmt.Sprintf("%v", success), wcStorage: storageType, }, ).Observe(float64(d)) } func newWCMethodDurationCounter(method string) metric[*prometheus.HistogramVec] { return newHistogramVec(prometheus.HistogramOpts{ Namespace: namespace, Subsystem: wcSubsystem, Name: fmt.Sprintf("%s_req_duration_seconds", method), Help: fmt.Sprintf("Accumulated %s request process duration", method), }, []string{wcShardID, wcSuccess, wcStorage}) } func newWCOperationCounterVec(operation string, labels []string) metric[*prometheus.CounterVec] { return newCounterVec(prometheus.CounterOpts{ Namespace: namespace, Subsystem: wcSubsystem, Name: fmt.Sprintf("%s_operation_count", operation), Help: fmt.Sprintf("The number of %s operations processed", operation), }, labels) } func newWCGaugeVec(name, help string, labels []string) metric[*prometheus.GaugeVec] { return newGaugeVec(prometheus.GaugeOpts{ Namespace: namespace, Subsystem: wcSubsystem, Name: name, Help: help, }, labels) }